Attach RGBA palettes from putpalette() when suitable #6054
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Resolves #6027
At the moment,
im.putpalette()only results in RGB palettes, discarding alpha information. The exception to this is when the mode is "RGBA", every 4th byte is extracted intoinfo. However, that isn't a flexible way of retrieving alpha data, letting #6027 down when a user wants to retain alpha information from the more irregular "RGBA;15".Instead, this PR changes
putpalette()to create either RGB or RGBA palettes, moving the work of handling alpha data to Pillow's unpackers.